Beringer Moto Master Cylinders are true works of art carved out of billet aluminum that feature Beringer patented Aerotec piston actuation system with a sealed ball bearing that allows the piston to travel in a perpendicular fashion in its bore with nearly zero side loads and seal compression or extension. The end result is a superbly smooth and easy actuation that allow more brake line pressure (braking power) with less effort on the lever and less rider hand fatigue. Two designs are available : with remote brake fluid reservoir for bike with angled clip-on bars or SuperMoto racers who prefer the ease of brake fluid level check and fill up; or with built-in billet brake fluid reservoir which is prefered by most supermoto racers as there is no risk of brake fluid feed hose disconnection in a crash, nor terminal damage to the reservoir and loss of fluid. Naked sportbikes can use the Beringer master cylinders with built-in reservoir for a clean high-tech look. Beringer master cylinders can be ordered with your choice of lever length and shape, a brake light or clutch safety swith and a standard or mirror-ready mounting clamp. BRO10 master cylinder have a 14.5mm bore and should be used with single 4 piston calipers and will offer a soft pull BR12 ands BRO12 master cylinders have a 17.5mm bore and should be used with single 6 piston calipers and will offer a soft pull. When used with a 4 piston caliper, it will offer a firm lever pull, but not as hard as other brands. BR14 and BRO14 master cylinders have a 20.5mm bore and are to be used with dual 4 or 6 piston calipers on most sportbikes and hyper bikes. Matching hydraulic clutch master cylinders are available with the same technical features :CRO9 is for most supermoto bikes with hydraulic clutch